peanut gallery

Noun

• rearmost or uppermost area in the balcony containing the least expensive seats

• (figurative) people whose criticisms are regarded as irrelevant or insignificant (resembling uneducated people who throw peanuts on the stage to express displeasure with a performance)
  • he ignored complaints from the peanut gallery
    

Related words

• Synonyms: 
  second balcony , family circle , upper balcony